CN113566342B - Energy-saving device of ventilation air-conditioning system of subway station and control method - Google Patents

Energy-saving device of ventilation air-conditioning system of subway station and control method Download PDF

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Publication number
CN113566342B
CN113566342B CN202110946960.7A CN202110946960A CN113566342B CN 113566342 B CN113566342 B CN 113566342B CN 202110946960 A CN202110946960 A CN 202110946960A CN 113566342 B CN113566342 B CN 113566342B
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China
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air
station
subway
energy
ventilation
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CN113566342A (en
Inventor
李兵
黄良君
卢佳廷
许红
杨旭龙
张家蕾
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Sichuan Jiumen Tiechuang Transportation Technology Co ltd
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Sichuan Jiumen Tiechuang Transportation Technology Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F7/003—Ventilation in combination with air cleaning
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/88—Electrical aspects, e.g. circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/89—Arrangement or mounting of control or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/02—Ducting arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/24—Means for preventing or suppressing noise
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/28—Arrangement or mounting of filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
    • F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
    • F24F7/08—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit with separate ducts for supplied and exhausted air with provisions for reversal of the input and output systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F8/00—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
    • F24F8/10—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
    • F24F8/108—Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering using dry filter elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F9/00—Use of air currents for screening, e.g. air curtains
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/24—Means for preventing or suppressing noise
    • F24F2013/247—Active noise-suppression

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ventilation (AREA)

Abstract

The invention discloses an energy-saving device of a ventilation air-conditioning system of a subway station and a control method, which mainly solve the problem of high energy consumption of the air-conditioning system of the conventional subway ventilation system. The system comprises a multifunctional building and escalator island type air supply unit arranged at a station hall to platform stairs or an escalator entrance, a multifunctional station channel air processing unit with air processing and air curtain functions arranged at a subway station entrance and exit channel, train piston air throttling devices arranged at two ends of a station driving tunnel, and a fan device driven by train braking energy. The invention firstly reduces the influence of piston wind effect on the station public area formed in the running process of the train and simultaneously increases the air resistance of the access passage of the station, thereby reducing the heat and mass exchange between the subway station tunnel and outdoor air and the subway public area and further greatly reducing the air-conditioning cold load of the public area; and secondly, the energy consumption of transmission and distribution is reduced, the optimal chilled water outlet temperature is selected, the operation energy efficiency is improved, and the energy-saving effect is achieved.

Description

Energy-saving device of subway station ventilation air-conditioning system and control method
Technical Field
The invention relates to the technical field of subway ventilation energy conservation, in particular to an energy-saving device and a control method for a ventilation air-conditioning system of a subway station.
Background
At present, in a room provided with an air conditioning system, in order to save energy and reduce energy consumption, an air conditioning area is generally required to be relatively closed. Except that the subway passageway should possess good indoor outer air isolation ability in air conditioner season, meet passenger flow peak and when conflagration, can not have the barrier in the passageway and influence the trafficability, in addition the curtain arouses disease propagation easily, consequently only can adopt the air curtain to reduce the station volume of leaking wind. However, the conventional air curtain machine provided only by the passageway of the entrance cannot serve the purpose of effectively isolating the indoor and outdoor air due to the piston wind effect of the train. The platform of the subway station is provided with the shielded gates, gaps exist among the shielded gate units, and air between a station public area and an interval tunnel can flow mutually by piston wind generated in the running process of the subway train in the interval tunnel. When a train leaves the station, outdoor air can flow into a station public area through a station access channel, and meanwhile, air in the station public area enters an interval tunnel through a shielding door gap; when a train enters a station, air in the tunnel enters a station public area through a shielding door gap, and meanwhile, the air in the station public area can flow to outdoor atmosphere through a station access channel, so that the piston wind effect of the train can cause a large amount of energy waste of an air conditioning system. Through field test and theoretical calculation, the air-conditioning cold load formed by piston wind effect of the train in summer in a typical subway station with a shield door system accounts for about 30-50% of the air-conditioning load of the whole public area.
The air handling capacity of the subway station is large, the combined air conditioning unit and the return/exhaust fan are usually arranged in air conditioner rooms at two ends of the station, and the air transmission and distribution distances of the air supply system and the air exhaust system are both 80-150 m. The long-distance and large-air-volume air transmission and distribution causes large power of the fan and high energy consumption of the ventilation system.
The subway station and the tunnel are communicated with the outdoor space only through the piston air shaft and the inlet and the outlet, have large space volume and are relatively closed, have the engineering characteristics of lack of sunlight irradiation, high air humidity and accumulation of air pollutants, and are not beneficial to diluting environmental pollutants. Dust content in air of subways and inter-section tunnels is large, and pollution of aerosol carrying microorganisms such as bacteria and fungi is often caused in the environment, so that disease transmission is easily caused. In addition, the heavy metal concentration in the tunnel often exceeds the background value of the local soil due to the friction between the train and the rail and the formation of ultrafine particles by a braking system and the like.
The subway station is only provided with a filter and an air purification device in the combined air conditioning unit, and other parts of the station and the tunnel are not provided with air treatment measures. When the concentration of moisture content, particulate matters, microorganisms and the like in the subway station exceeds the environmental sanitation requirement in non-air-conditioning seasons, ventilation and air purification treatment can be carried out only by starting a combined air conditioning unit and a return/exhaust well in a station public area. However, ventilation air conditioning systems with high distribution power have high operating costs and poor economy.
Meanwhile, the distance between subway stations is short, the trains are started and braked frequently, about 40 percent of energy is wasted, and the recoverable braking energy is considerable. The inverter feedback type can not completely utilize the braking energy, and a braking resistor still needs to be configured. The electric energy absorbed by the partial resistance type regenerative braking is not effectively utilized, the energy is consumed by the resistor in a heating mode, certain energy waste exists, and the burden of station air conditioners and ventilation facilities can be increased due to the dissipated heat.
Disclosure of Invention
The invention aims to provide an energy-saving device of a ventilation and air-conditioning system of a subway station and a control method, and mainly solves the problem that the conventional subway ventilation and air-conditioning system is high in energy consumption.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the energy-saving device comprises a multifunctional staircase island type air supply unit arranged at a station hall to a platform stair or a staircase entrance, a station passage multifunctional air processing unit arranged at a passage of the subway station entrance and exit and having air processing and air curtain functions, a subway tunnel train piston air throttling device arranged at two ends of a station driving tunnel and a device for driving a fan by utilizing train braking energy.
Furthermore, the island type air supply unit of the multifunctional building escalator is composed of a plurality of vertical modular air-conditioning air supply units arranged on a station floor above the space of the building escalator; the single vertical modular air-conditioning air supply unit comprises a vertical outer shell fixed on a floor slab of a standing hall, a first air inlet arranged at the lower end of the side face of the vertical outer shell, a second air inlet arranged at the top of the vertical outer shell, a plurality of first nozzles arranged at the upper end of the side face of the vertical outer shell, an air supply hole arranged at the bottom of the vertical outer shell and penetrating through the floor slab of the standing hall and used for supplying air to the floor slab of the standing hall, and a reversible fan arranged in the vertical outer shell; and the first air inlet and the second air inlet are respectively provided with a first filter.
Furthermore, the multifunctional air handling unit for the station passage consists of a plurality of horizontal modular air conditioning blower units arranged in a suspended ceiling passage at an entrance and an exit of a subway; the single horizontal modular air-conditioning air supply unit comprises a horizontal outer shell on a suspended ceiling channel of a subway entrance, an air inlet pipe arranged at one end, facing the subway entrance, of the horizontal outer shell, a partition plate arranged in the horizontal outer shell, a unit return air channel arranged above the partition plate, a third air inlet arranged at one side, facing a station hall, of the horizontal outer shell and communicated with the unit return air channel, a fan arranged in the space of the horizontal outer shell below the partition plate, a second nozzle arranged at one side, facing the station hall, of the horizontal outer shell and communicated with the horizontal outer shell where the fan is located, and a plurality of slotted nozzles arranged at one side, facing the subway channel surface, of the horizontal outer shell; and a second filter and an electronic purification device are arranged at one end, close to the air inlet pipe, in the outer shell channel where the fan is positioned, and an air speed sensor is also arranged in the subway entrance and exit channel.
Furthermore, the subway tunnel train piston air throttling device comprises piston air flow blocking walls which are arranged in the train tunnel and close to piston air shafts of stations at two ends; and a door opening through which a train passes is reserved in the middle of the piston wind blocking flow wall, and the door opening is larger than the outer contour of a train limit in a tunnel between trains.
Furthermore, the driving device utilizing the train braking energy comprises an inverter connected in parallel with a power supply system of the subway locomotive, an isolation transformer connected with the inverter and a tunnel exhaust fan connected with the isolation transformer; the inverter comprises a signal processor connected with the input end of the isolation transformer, a PI controller connected with the signal processor, an SPWM controller connected with the PI controller, a driving loop connected with the SPWM controller, and a PWM inverter with a control signal receiving end connected with the driving loop; the input end of the PWM inverter is connected in parallel to a power supply system of the subway locomotive, and the output end of the PWM inverter is connected with the input end of the isolation transformer.
Furthermore, electric air valves are arranged at the positions of the first air inlet, the second air inlet, the air supply hole, the first nozzle, the tail end of the air supply pipe, the third air inlet, the second nozzle and the strip seam nozzle.
Furthermore, silencers are arranged at the front end and the rear end of the reversible fan and the fan; and surface air coolers are also arranged at the air inlet ends of the reversible fan and the fan.
Further, an LC filter is connected between the PWM inverter and the isolation transformer.
The invention also provides a control method of the energy-saving device of the ventilation and air-conditioning system of the subway station, which is suitable for the energy-saving system of the ventilation and air-conditioning system of the subway station and the energy-saving device of the ventilation and air-conditioning system of the subway station, and comprises the following measures:
(S1) reducing the cold load requirement of a ventilation air-conditioning system of a subway station by adopting a multifunctional air processing unit of a station channel, a subway tunnel train piston air throttling device and a fan driving device by utilizing train braking energy;
(S2) reducing the total power distribution power of a ventilation and air-conditioning system of the subway station by adopting an island type air supply unit of the multifunctional building staircase of the subway station and a multifunctional air handling unit of a station channel;
and (S3) dynamically adjusting the water outlet temperature of the water chilling unit according to the indoor design temperature and humidity, the outdoor temperature and humidity and the indoor air conditioning load of the subway station, determining the water supply temperature of the chilled water, and improving the equivalent grade of the water chilling unit in the ventilation air conditioning system of the subway station, so that the optimal energy efficiency of the ventilation air conditioning system of the subway station is obtained.
Further, in the present invention, the calculation formula of the chilled water supply water temperature is:
t 0 ＝COP fruit of Chinese wolfberry ·(273+t k )/(k+COP Fruit of Chinese wolfberry )+Δt 0 ―273≤t N ―8.5
Wherein, t 0 Supplying water temperature to the chilled water; COP Fruit of Chinese wolfberry The refrigeration coefficient of the water chilling unit; t is t k The condensation temperature of the water chilling unit; k is a correction coefficient; Δ t 0 The actual temperature difference on the evaporator side; t is t N Dry bulb temperature was calculated for the platform air design.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention firstly reduces the influence of piston wind effect on the public area of the station in the running process of the train and simultaneously increases the air resistance of the passageway at the entrance and the exit of the station, thereby reducing the heat and mass exchange between the tunnel of the subway station and the outdoor air and the public area of the subway and further greatly reducing the cold load of the air conditioner in the public area. Secondly, the setting position of the air conditioner tail end is optimized, and the air conditioner air supply tail end is arranged in an air conditioner room, so that the total power distribution capacity of an air transmission and distribution system of a ventilation air-conditioning system is greatly reduced, and the energy-saving effect is achieved.
(2) In the invention, the subway station multifunctional staircase island type air supply unit has the unique function of supplying air to a platform public area besides the function of a conventional air conditioner terminal unit by arranging a plurality of vertical modular air conditioner air supply units at the entrance part of the staircase from a station hall to a platform. The device has the functions of air conditioning air supply, ventilation air supply, purification, smoke exhaust and air supplement at the station and the like. And the invention cancels long-distance blast pipes and exhaust pipes, thus greatly reducing the transmission and distribution energy consumption of the air system of the ventilation air-conditioning system.
(3) In the invention, the island type air supply unit of the multifunctional staircase of the subway station can be independently started in non-air-conditioning seasons and can be used as an indoor air purification unit, thereby overcoming the defect of large power consumption when a combined air conditioning unit is started. Meanwhile, when the air quality of the platform does not meet the hygienic requirements of personnel, the fan of the device is reversely turned on, and fresh air entering the passageway of the 'relay' station exit is delivered to the public area of the platform, so that the fresh air volume requirement of the personnel at the platform is met.
(4) When a platform is in fire, the island type air supply unit fan of the multifunctional stair ladder of the subway station is reversed, the air supply direction is from the station hall layer to the platform layer along the stair opening, the downward airflow with the size of not less than 1.5m/s at the stair or the stair opening from the station hall to the platform or the requirement of the same function can be realized by utilizing the device, other engineering measures such as accessing a heat extraction system into a platform public area and the like are not needed, and the design of a platform smoke exhaust system is simplified.
(5) The multifunctional air handling unit for the access passage of the subway station is provided with two electric valves respectively at the air inlet end and the air outlet end of an air conditioning unit. By opening and switching the valve, the air curtain can simultaneously have the functions of air treatment, air curtain and outdoor air introduction. In the air conditioning season, in the process of train entering and leaving, the device supplies air downwards, and the flow resistance of channel air is increased through multiple air curtains formed, so that indoor and outdoor air exchange is effectively isolated, and further the air conditioning load is reduced. When the piston wind effect formed by the train basically has no influence on the access passage of the subway station, the device forwards supplies air to the station hall public area, and then cools the public area. For non-air-conditioning seasons, the device can send outdoor fresh air to a station hall public area through an inlet and outlet channel and provide the station staff with fresh air volume requirements. When a fire disaster occurs at the platform, the device operates under a ventilation working condition, so that the air resistance of outdoor air flowing from the entrance, the exit and the station hall to the public area of the platform can be overcome, the air power of an air supplementing channel is increased, and the requirement of fire fighting and air supplementing is met.
(6) After the piston air throttling device is arranged in the tunnel between the trains of the subway station, the resistance of the piston air entering the front tunnel through the throttling device is increased, the flow is reduced, and the air flow value flowing to the outdoor atmosphere through the piston air duct is increased correspondingly. When the train passes through the throttling device, due to the shielding of a train carriage, the air passing net area of the ventilation branch is minimum, the air flow resistance is maximum, the flow of piston air formed by the train flowing outdoors reaches the maximum, and the effect of the throttling device is most obvious. Therefore, the high load of the train piston wind effect on the air conditioning system in summer can be greatly reduced.
(7) The train braking energy driving device provided by the invention adjusts the energy generated by vehicle braking into the required voltage through the DC/AC inverter and the isolation transformer, and supplies the voltage to electric devices such as a tunnel fan or a fan of a heat exhaust fan of a subway station for use. When a train enters a station and is braked, the braking energy of the train is utilized to drive a fan, more piston wind is removed from the station, on one hand, the ventilation volume of a tunnel in a subway section can be increased, the cooling load of an air conditioner in the subway station can be reduced, and the effects of energy conservation and emission reduction can be achieved; on the other hand, the device can balance the voltage of the high-voltage power grid and avoid the impact of train braking energy on the high-voltage power grid.
(8) The train braking energy driving device can filter a large amount of harmonic waves contained in alternating current output by the inverter by arranging the LC filter, and meanwhile, in order to prevent direct current from entering an alternating current side when a bridge arm of the inverter has a short-circuit fault, an isolation transformer is additionally arranged at an output end for isolation.
(9) The control loop in the train braking energy driving device adopts an SPWM control strategy, a digital proportional integral PI controller is used for voltage control, the control circuit feeds back the inverted three-phase electricity to the controller, the three-phase electricity is analyzed and calculated by a Digital Signal Processor (DSP), and the drive loop controls the on and off of an Insulated Gate Bipolar Translator (IGBT) of the PWM so as to regulate a sine wave circuit. The controller can also modulate sinusoidal circuits with different frequencies, such as 0-50 Hz electricity, by controlling the on-off frequency of the IGBT, so that the fan can be started in a variable frequency manner, and the impact on a power grid cannot be caused.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic sectional structure view of the island type air supply unit of the multi-functional staircase installed in a subway station.
Fig. 3 is a schematic top view of the island type air supply unit of the multi-functional staircase installed in a subway station.
Fig. 4 is a schematic longitudinal sectional view showing the installation of the multifunctional air handling unit for a station passage in a subway station according to the present invention.
Fig. 5 is a schematic cross-sectional structure view of the multifunctional air handling unit for a station passage installed in a subway station according to the present invention.
Fig. 6 is a schematic structural diagram of the train piston air throttling device in the invention.
Fig. 7 is a schematic plane structure diagram of the train piston wind throttling device.
Fig. 8 is a schematic sectional structure diagram of the train piston air throttling device in the invention.
FIG. 9 is a schematic diagram of the overall structure of a fan assembly driven by train braking energy according to the present invention.
FIG. 10 is a schematic block diagram of an inverter apparatus for driving a fan apparatus using train braking energy according to the present invention.
Wherein, the names corresponding to the reference numbers are:
1-multi-function building staircase island type air supply unit, 2-station passage multi-function air handling unit, 3-subway tunnel train piston air throttle device, 4-electric air valve, 5-muffler, 6-surface cooler, 10-vertical modular air conditioning blower unit, 11-outer casing, 12-first air inlet, 13-second air inlet, 14-first nozzle, 15-air supply hole, 16-reversible fan, 17-first filter, 20-horizontal modular air conditioning blower unit, 21-outer casing, 22-air inlet pipe, 23-partition board, 24-unit return duct, 25-third air inlet, 26-fan, 27-second nozzle, 28-strip slit nozzle, 29-second filter, 210-electronic purification device, 211-air speed sensor, 30-piston air shaft, 31-piston air baffle wall, 32-hall door opening, 40-station hall structure top plate, 41-station suspended ceiling, 42-suspended ceiling, 43-smoke baffle suspended wall, 44-staircase, 45-station building staircase, 45-top plate, 46-top plate, table top plate-47-passage structure, table top plate-54-floor structure, 50-subway passage-hall entrance-entrance, 52-subway entrance-exit-entrance, 53-subway tunnel entrance, 50-subway entrance and 16-subway entrance.
Detailed Description
The present invention will be further described with reference to the following description and examples, which include but are not limited to the following examples.
Examples
As shown in fig. 1, the energy-saving device of a ventilation air-conditioning system for a subway station disclosed by the invention comprises a multifunctional staircase island type air supply unit 1 arranged at a position from a station hall to a platform staircase or an escalator entrance, a station passage multifunctional air processing unit 2 arranged at a passage at the subway station entrance and exit and having air processing and air curtain functions, a subway tunnel train piston air throttling device 3 arranged at two ends of a station driving tunnel, and a fan device driven by train braking energy. The system firstly reduces the influence of a piston wind effect formed in the running process of a train on a station public area, and simultaneously increases the air resistance of an entrance and exit channel of the station, thereby reducing the heat and mass exchange between a subway station tunnel and outdoor air and the subway public area, and further greatly reducing the air-conditioning cold load of the public area. And secondly, the setting position of the air conditioner tail end is optimized, and the air conditioner air supply tail end is arranged in an air conditioner room, so that the total power distribution capacity of an air transmission and distribution system of the ventilation air-conditioning system is greatly reduced. When a train enters a station and is braked, the braking energy of the train is utilized to drive a fan, and more piston air is exhausted out of the station, so that on one hand, the ventilation volume of a tunnel in a subway section can be increased, the cooling load of an air conditioner in the subway station can be reduced, and the effects of energy conservation and emission reduction can be achieved; on the other hand, the device can balance the voltage of the high-voltage power grid and avoid the impact of train braking energy on the high-voltage power grid.
In this embodiment, as shown in fig. 2 and 3, a common subway station is provided with a station hall structure top plate 40 and a station hall ceiling 41, a station floor layer supported by a floor slab 46 is arranged in the middle, a station ceiling 42 is arranged below the floor slab, a smoke blocking vertical wall 43 is arranged on one side of the floor slab, the station floor layer is arranged below the station hall layer, and the station hall layer is arranged below a station table surface 45 through a staircase 44. In the system, the island type air supply unit of the multifunctional building and staircase of the subway station is composed of four vertical modular air conditioning and air supplying units 10 arranged on a floor slab of a station hall above a space of the building and staircase. The four vertical modular air conditioning blower units 10 are arranged in a line, the two units in the middle are used for blowing air in the front and the back directions, and the two units on the edges are used for blowing air in the three directions. The air supply unit can supply air to the station hall layer and the station platform layer at the same time.
The multifunctional building staircase island type air supply unit is composed of a plurality of vertical modular air conditioning air supply units 10 arranged on a station hall floor above a building staircase space; the single vertical modular air conditioning blower unit 10 comprises a vertical outer casing 11 fixed on a floor of a standing hall, a first air inlet 12 arranged at the lower end of the side surface of the vertical outer casing 11, a second air inlet 13 arranged at the top of the vertical outer casing 11, a plurality of first nozzles 14 arranged at the upper end of the side surface of the vertical outer casing 11, a blowing hole 15 arranged at the bottom of the vertical outer casing 11 and penetrating through the floor of the standing hall and used for blowing air to a standing layer, and a reversible fan 16 arranged in the vertical outer casing 11; wherein, the first air inlet 12 and the second air inlet 13 are both provided with a first filter 17.
In this embodiment, the first air inlet 12, the second air inlet 13, the air supply hole 15, and the first nozzle 14 are all provided with an electric air valve 4, and the electric air valves at corresponding positions are respectively marked as an electric air valve a, an electric air valve B, an electric air valve C, and an electric air valve D.
In the season of the air conditioner, the electric air valve A and the electric air valve D are opened, and the electric air valve C and the electric air valve B are closed. A fan in the air conditioning unit rotates forwards, the fan provides air flowing power, indoor air flows through a first air inlet 12, firstly, air is purified through a first filter 17 arranged at the first air inlet 12, then the air flows through an opened electric air valve, then the air is cooled and dehumidified through a surface air cooler 6, and cold air after air treatment is sent to an air conditioning room through an opened electric air valve D and a first nozzle 14. The purpose of air conditioning and cooling the station hall is achieved through the processes. In the invention, the vertical outer casing 11 is provided with the silencers 5 at the upper and lower ends of the fan 16. The noise generated in the running process of the fan is processed by the mufflers arranged in the front and the back, so that the running noise of the equipment meets the requirement.
For the ventilation season: and opening the electric air valve B and the electric air valve C, and opening the electric air valve A and the electric air valve D. The fan in the air conditioning unit is reversed, the fan provides air flowing power, indoor air flows through the second air inlet 13, the air is firstly purified by the first filter 17 arranged at the second air inlet 13, then the air flows through the electric air valve B, and the air in the station hall is sent to the station layer after passing through the air supply diversion and expansion device arranged below the air supply hole 15.
When a fire disaster happens on the platform layer: and the electric air valve B and the electric air valve C are opened, and the electric air valve A and the electric air valve D are closed. The fan in the air conditioning unit is reversed, the fan provides air flow power, indoor air flows through the second air inlet 13, the air is purified by the first filter 17, then the air flows through the opened electric air valve, and the air in the station hall is delivered to the station layer after being delivered through the air supply, flow guide and expansion device. The requirements of national standard standards such as subway design Specification (GB 50157) and subway design fireproof Standard (GB 51298) are met, namely: when a fire disaster happens to the subway platform, the downward airflow from the station hall to the stair or the staircase mouth of the platform is not smaller than 1.5 m/s.
In addition, in the present embodiment, the outer vertical surface of the outer casing 11 is provided with an air supply unit outer decoration. The outer decoration of the air supply unit can integrate the functions of an advertisement display screen or a lamp box, a commodity vending device, passenger self-service and the like.
As shown in fig. 4 and 5, for a subway station passage area, the structure of the subway station passage includes a station hall structure top plate 40, a passage structure top plate 47, an entrance passage ceiling 49, a structure bottom plate 48, a station hall public area ceiling 50, a station hall 51 and an entrance passage 52. The multifunctional air handling unit for the access passage in the system is composed of five horizontal modular air conditioning blower units 20 arranged in a suspended ceiling passage at the access of a subway. The four vertical modular air-conditioning air supply units 1 are arranged in a line and used for supplying air to the station hall layer and the passageway at the entrance and the exit.
In this embodiment, the station aisle multifunctional air handling unit is composed of a plurality of horizontal modular air conditioning blower units 20 arranged in a suspended ceiling passageway of a subway entrance; the single horizontal modular air conditioning blower unit 20 comprises a horizontal outer casing 21 on a suspended ceiling channel of a subway entrance, an air inlet pipe 22 arranged at one end, facing the subway entrance, of the horizontal outer casing 21, a partition plate 23 arranged in the horizontal outer casing 21, a unit return air duct 24 arranged above the partition plate 23, a third air inlet 25 arranged at one side, facing the station hall, of the horizontal outer casing 21 and communicated with the unit return air duct 24, a fan 26 arranged in the space of the horizontal outer casing 21 below the partition plate 23, a second nozzle 27 arranged at one side, facing the station hall, of the horizontal outer casing 21 and communicated with the horizontal outer casing 21 where the fan 26 is located, and a plurality of slotted nozzles 28 arranged at one side, facing the subway channel surface, of the horizontal outer casing 21; a second filter 29 and an electronic purification device 210 are arranged at one end of the channel of the outer casing 21 where the fan is located, which is close to the air inlet pipe 22, and an air speed sensor 211 is also arranged in the channel of the subway entrance. The tail end of the air inlet pipe 22, the third air inlet 25, the second nozzle 27 and the strip seam nozzle 28 are respectively provided with an electric air valve 4, and the electric air valves 10 corresponding to the electric air valves are respectively marked as an electric air valve E, an electric air valve F, an electric air valve G and an electric air valve H.
In the air-conditioning season: and closing the electric air valve E, opening the electric air valve F, and selectively opening the electric air valve G and the electric air valve H according to the actual working condition. When the air velocity sensor 211 monitors that the air velocity in the subway entrance/exit passage is less than the set value V 0 When the electric air valve G is opened, the electric air valve H is closed. After the air in the station hall flows through the air inlet, passes through the electric air valve F and passes through the unit air return duct 24, the air is purified by the second filter 29 and the electronic purification device 210 arranged at the front end of the fan 26, the air is cooled and dehumidified by the surface air cooler 6, and the cold air after air treatment is sent to the station hall through the opened electric air valve G and the second nozzle 27. The purpose of air conditioning and cooling the station hall is achieved through the processes.
When a train enters or leaves a station, piston wind effect generated in the running process of the train can cause air flow of a passageway at an entrance and an exit of the station. When the air velocity sensor E monitors that the air velocity in the subway entrance/exit channel is greater than a set value V 0 When the variable frequency fan runs at a high speed, the electric air valve H is opened, and the electric air valve G is closed. After the air in the station hall flows through the third air inlet 25, passes through the electric air valve F and passes through the unit air return duct 24, the second filter 29 and the electronic purification device 210 purify the air, the air is cooled and dehumidified by the surface air cooler 6, and the cold air after air treatment is openedAfter the electric air valve H, air is sprayed out at a high speed perpendicular to the ground to form multiple air curtains, so that the purposes of increasing the air flow resistance in a channel, effectively isolating indoor and outdoor air exchange and further reducing the air conditioning load of a station are achieved. The air curtain formed by cooling the station hall by the air conditioner through the process can effectively isolate indoor and outdoor air, and the air conditioner load can be greatly reduced.
For the ventilation season: and opening the electric air valve E and the electric air valve G, and closing the electric air valve F and the electric air valve H. The air in the station hall flows through the air inlet pipe 22, is purified by the second filter 29 and the electronic purification device 210, and then is delivered to the station hall through the second nozzle 27. Through the process, the outdoor fresh air can be treated and then sent to the subway station hall, and the requirement of the fresh air quantity required by staff in the station hall is met.
In the system, the front end and the rear end of the fan 26 are also provided with the silencers 5. The noise generated in the running process of the fan is processed by the mufflers arranged in the front and the back, so that the running noise of the equipment meets the requirement.
As shown in fig. 6 to 8, in the system, the subway tunnel train piston wind throttling device 3 comprises a piston wind blocking flow wall 31 arranged at a piston wind shaft 30 close to stations at two ends in a train tunnel; a door opening 32 through which a train passes is reserved in the middle of the piston wind blocking flow wall 31, and the door opening 32 is larger than an outer wheel of a train limit in a tunnel between trains. (ii) a A door opening 32 through which a train passes is reserved in the middle of the piston windshield flow wall 31, and the door opening 32 is larger than the outer contour of a train limit in a tunnel between trains. When a train enters a station, one part of piston wind generated by the train is discharged to the outside through the station piston wind shaft 30, the other part of the piston wind flows along the running direction of the subway train 54, and the part of the piston wind generated by the train flows to a platform public area through a shielding door gap or an opened shielding door. The subway tunnel train piston air throttling device arranged at the station entering end of the station rail running area can increase the air flow resistance of piston air flowing to stations and tunnels, so that more piston air flows to the outside through the station entering end piston air duct.
When the train leaves the station, due to the effect of piston wind generated by the forward running of the train, cold air in a platform public area flows to the interval tunnel through a shielding door gap or an opened shielding door, and meanwhile, outdoor air enters the interval tunnel through a piston air duct. The piston air throttling device of the subway tunnel train arranged at the station exit end of the station rail running area increases the resistance of cold air in the platform public area entering the interval tunnel, so that more outdoor air enters the interval tunnel through the piston air channel at the station exit end, and the air conditioning load of the subway station public area is reduced.
According to the fluid mechanics principle, when the flow of the main pipeline is unchanged, the flow proportion between the ventilation branch pipelines is inversely proportional to the resistance of the ventilation branch pipelines. When the resistance of one of the ventilation branches increases, the air flow of the ventilation branch will decrease, while the air flow of the other ventilation branch will increase. Correspondingly, after the piston air throttling device is arranged in the tunnel between the trains of the subway station, the resistance of the piston air entering the front tunnel through the throttling device is increased, the flow is reduced, and the air flow value flowing to the outdoor atmosphere through the piston air channel is increased correspondingly. When the train passes through the throttling device, due to the shielding of a train carriage, the air passing net area of the ventilation branch is minimum, the air flow resistance is maximum, the flow of piston air formed by the train flowing outdoors reaches the maximum, and the effect of the throttling device is most obvious.
At present, most urban subway tractors use 35KV or 10KV power grids, and the power grids are rectified by 12 pulse waves through a traction rectifier transformer to output 1500V or 750V direct current to supply power to locomotives. The regenerative braking energy device is connected in parallel in a 1500V direct current or 750V direct current system, is inverted into alternating current, is regulated by a transformer, is modulated into 400V alternating current, and can be used for the fan.
As shown in fig. 9 and 10, in the system, the fan driving device using train braking energy includes an inverter connected in parallel to a power supply system of a subway locomotive, an isolation transformer connected to the inverter, and a tunnel exhaust fan connected to the isolation transformer; the inverter comprises a signal processor connected with the input end of the isolation transformer, a PI controller connected with the signal processor, an SPWM controller connected with the PI controller, a driving loop connected with the SPWM controller, and a PWM inverter with a control signal receiving end connected with the driving loop; the input end of the PWM inverter is connected in parallel to a power supply system of the subway locomotive, and the output end of the PWM inverter is connected with the input end of the isolation transformer.
In the present embodiment, the PWM inverter is a bridge circuit composed of 6 IGBTs, and converts direct current into alternating current. The control loop adopts an SPWM control strategy, a digital proportional-integral PI controller is used for voltage control, the control circuit feeds back the inverted three-phase electricity to the controller, the three-phase electricity is analyzed and calculated by a Digital Signal Processor (DSP), and the IGBT of the PWM is controlled to be switched on and off by the driving loop, so that a sine wave circuit is regulated. The controller can also modulate sinusoidal circuits with different frequencies, such as 0-50 Hz electricity, by controlling the on-off frequency of the IGBT, so that the fan can be started in a variable frequency manner, and the impact on a power grid cannot be caused. And because the alternating current output by the inverter contains a large amount of harmonic waves, an LC filter is arranged for filtering, and meanwhile, in order to prevent the direct current from entering an alternating current side when a certain bridge arm of the inverter has a short-circuit fault, an isolation transformer is additionally arranged at the output end for isolation.
The system uses the energy generated in the subway train station-entering braking process to perform inversion rectification to output the alternating current of 400V 0-50 HZ, and the alternating current is supplied to a tunnel fan or a hot air exhauster of a subway station for use, so that more piston air is exhausted out of the station, on one hand, the ventilation volume of the tunnel between subway sections can be increased, the air-conditioning cold load of the subway station is reduced, and the effects of energy conservation and emission reduction are achieved; on the other hand, the device can balance the voltage of the high-voltage power grid and avoid the impact of train braking energy on the high-voltage power grid.
The invention also provides a control method of the subway station ventilation air-conditioning energy-saving system, which is used for obtaining the optimal air-conditioning system energy efficiency of the subway station ventilation system and comprises the following measures:
(S1) reducing the cold load requirement of a ventilation air-conditioning system of a subway station by adopting a multifunctional air processing unit of a station channel, a subway tunnel train piston air throttling device and a fan driving device by utilizing train braking energy;
(S2) reducing the total power distribution power of a ventilation and air-conditioning system of the subway station by adopting an island type air supply unit of the multifunctional building staircase of the subway station and a multifunctional air handling unit of a station channel;
and (S3) dynamically adjusting the water outlet temperature of the water chilling unit according to the indoor design temperature and humidity, the outdoor temperature and humidity and the indoor air conditioning load of the subway station, determining the water supply temperature of the chilled water, and improving the equivalent grade of the water chilling unit in the ventilation air conditioning system of the subway station, so that the optimal energy efficiency of the ventilation air conditioning system of the subway station is obtained.
Specifically, a subway station belongs to an underground building, the design of an air conditioning system in a public area only meets the requirement of transitional comfort, the indoor design temperature is 3-4 ℃ higher than that of a conventional comfortable air conditioner, the indoor air relative humidity is 40-70%, and the air conditioning terminal unit is supposed to have higher air supply temperature. And the multifunctional building escalator island type air supply unit, the multifunctional station channel air treatment unit and other room air treatment units are arranged in the air-conditioning room, so that the conveying energy consumption of the air system is greatly reduced, and the possibility of reducing the air supply temperature difference of the air conditioner is provided.
The design temperature of indoor air of a station hall in a public area of an underground station is not more than 30 ℃, the design temperature of air of a platform in the public area is 1-2 ℃ lower than the design temperature of air of the station hall, and the relative humidity of the air of the station hall and the air of the platform is 40-70 percent, which is specified by the design standard of ventilation air conditioning and heating of urban rail transit (GB/T51357). When the upper limit air-conditioning indoor design temperature required by the standard of a subway station hall is 30 ℃ and the relative humidity is 70%, the dew point temperature of indoor air is 24.0 ℃; the platform takes the upper limit air-conditioning indoor design temperature required by the specification as 29 ℃, the relative humidity is 70 percent, and the dew point temperature of the indoor air is 22 ℃. The actual air supply temperature of the air conditioner can meet the cooling requirement by taking the air supply temperature difference of 5-6 ℃ into consideration and taking 23-24 ℃. Then the heat exchange temperature difference of 3-4 ℃ is considered, the corresponding chilled water supply temperature can be 19-20 ℃, and the chilled water temperature meets the cooling and dehumidifying requirements of the air conditioning system.
Calculating a formula according to the inverse Carnot cycle refrigeration coefficient epsilon: ε = To/(Tk-To), tk is the condensation temperature (K) and To is the evaporation temperature (K). If To and Tk are increased, then ε c will be increased. According to measurement and calculation, the theoretical highest coefficient of performance COP of the water chilling unit is 8.7 under the conditions that the supply and return water temperature of chilled water is 7/12 ℃ and the supply and return water temperature of cooling water is 30/35 ℃. If a high-temperature water chilling unit with the cold water temperature of 19/24 ℃ is adopted, the theoretical highest coefficient of performance COP of the water chilling unit is 15.5 under the same condition, so the energy efficiency of the high-temperature water chilling unit adopting the water supply temperature of 19 ℃ is far higher than that of the conventional water chilling unit. Therefore, on the premise of meeting the air supply temperature requirement of the air conditioner, the water outlet temperature of the water chilling unit is increased as much as possible, and the method is an effective way for improving the energy efficiency of the refrigerating unit.
The outlet water temperature range of the high-temperature water chilling unit is 12-20 ℃, in the actual operation process, the outlet water temperature of the water chilling unit is dynamically adjusted according to the indoor design temperature and humidity, the indoor air conditioner load, the outdoor temperature and humidity and the like, and the optimal chilled water supply temperature is determined according to the formula, so that the water chilling unit is in the optimal efficient energy efficiency state.
Wherein, the chilled water supply water temperature determination formula is as follows:
t 0 ＝COP fruit of Chinese wolfberry ·(273+t k )/(k+COP Fruit of Chinese wolfberry )+Δt 0 ―273≤t N ―8.5
t 0 -temperature of chilled water supply water, DEG C
COP Fruit of Chinese wolfberry -cooling coefficient of water chiller
t k -cooling water set condensation temperature, deg.c
k-correction factor
Δt 0 -actual temperature difference at evaporator side, ° c
t N -platform air design dry bulb temperature calculation deg.c
If the indoor design of the air conditioner at the platform of a certain subway station calculates the dry-bulb temperature t N To a determined value, the condensing temperature t of the water chilling unit k And coefficient of performance (COP) of water chilling unit under different load conditions Fruit of Chinese wolfberry For constant value, the correction coefficient k and the actual temperature difference delta t at the evaporator side 0 And obtaining the operation data according to the history. From the formula t 0 ＝COP Fruit of Chinese wolfberry ·(273+t k )/(k+COP Fruit of Chinese wolfberry )+Δt 0 The corresponding coldness was obtained from the equation of 273 (. Degree. C.)Frozen water supply temperature as long as t 0 ≤t N 8.5 (DEG C), the optimum chilled water supply temperature for the best energy efficiency of the air conditioning system under the working condition is obtained. The water chilling unit can adjust the corresponding chilled water supply temperature according to different load loads, so that the optimal energy efficiency of the air conditioning system is obtained.
The above-mentioned embodiment is only one of the preferred embodiments of the present invention, and should not be used to limit the scope of the present invention, but all the insubstantial modifications or changes made within the spirit and scope of the main design of the present invention, which still solve the technical problems consistent with the present invention, should be included in the scope of the present invention.

Claims (7)

1. An energy-saving device of a ventilation air-conditioning system of a subway station is characterized by comprising a multifunctional building and staircase island type air supply unit (1) which is arranged at a station hall to a platform stair or a staircase entrance, a station channel multifunctional air processing unit (2) which is arranged at a passage of a subway station entrance and exit and has the functions of air processing and air curtain, a subway tunnel train piston air throttling device (3) which is arranged at two ends of a station driving tunnel and a fan device driven by train braking energy;
the island type air supply unit of the multifunctional building escalator consists of a plurality of vertical modular air conditioning air supply units (10) arranged on a station floor above the space of the building escalator; the single vertical modular air conditioning blower unit (10) comprises a vertical outer casing (11) fixed on a floor of a standing hall, a first air inlet (12) arranged at the lower end of the side surface of the vertical outer casing (11), a second air inlet (13) arranged at the top of the vertical outer casing (11), a plurality of first nozzles (14) arranged at the upper end of the side surface of the vertical outer casing (11), a blowing hole (15) arranged at the bottom of the vertical outer casing (11) and penetrating through the floor of the standing hall and used for blowing air to a standing layer, and a reversible fan (16) arranged in the vertical outer casing (11); wherein, the first air inlet (12) and the second air inlet (13) are respectively provided with a first filter (17);
the multifunctional air handling unit for the station passage consists of a plurality of horizontal modular air conditioning and blowing units (20) arranged in a suspended ceiling passage at a subway entrance and exit; the single horizontal modular air-conditioning air supply unit (20) comprises a horizontal outer casing (21) on a suspended ceiling channel of a subway entrance and exit, an air inlet pipe (22) arranged at one end, facing the subway entrance and exit, of the horizontal outer casing (21), a partition plate (23) arranged in the horizontal outer casing (21), a unit return air duct (24) arranged above the partition plate (23), a third air inlet (25) arranged at one side, facing the station hall, of the horizontal outer casing (21) and communicated with the unit return air duct (24), a fan (26) arranged in the space of the horizontal outer casing (21) below the partition plate (23), a second nozzle (27) arranged at one side, facing the station hall, of the horizontal outer casing (21) and communicated with the horizontal outer casing (21) where the fan (26) is located, and a plurality of strip seam nozzles (28) arranged at one side, facing the subway channel surface, of the horizontal outer casing (21); a second filter (29) and an electronic purification device (210) are arranged at one end, close to an air inlet pipe (22), in a channel of the horizontal outer shell (21) where the fan is located, and an air speed sensor (211) is further arranged in the channel of the subway entrance and exit;
the subway tunnel train piston wind throttling device (3) comprises piston wind blocking flow walls (31) which are arranged in the train tunnel and close to piston wind shafts (30) of stations at two ends; a door opening (32) through which a train passes is reserved in the middle of the piston wind blocking flow wall (31), and the door opening (32) is larger than the outer contour of a train limit in a tunnel between trains.
2. The energy-saving device for the ventilation and air-conditioning system of the subway station as claimed in claim 1, wherein said driving device using train braking energy comprises an inverter connected in parallel to the power supply system of the subway locomotive, an isolation transformer connected to the inverter, and a tunnel fan or a hot air exhauster connected to the isolation transformer; the inverter comprises a signal processor connected with the input end of the isolation transformer, and the signal processor adopts PI and SPWM control algorithms to control a PWM inverter loop connected with a driving loop; the input end of the PWM inverter is connected in parallel to a power supply system of the subway locomotive, and the output end of the PWM inverter is connected with the input end of the isolation transformer.
3. The energy-saving device for the ventilation and air-conditioning system of the subway station as claimed in claim 2, wherein the first air inlet (12), the second air inlet (13), the blast hole (15), the first nozzle (14), the end of the air inlet pipe (22), the third air inlet (25), the second nozzle (27) and the slit nozzle (28) are all provided with an electric air valve (4).
4. The subway station ventilation air-conditioning system energy-saving device as claimed in claim 3, wherein said reversible fan (16) and fan (26) are further provided with mufflers (5) at front and rear ends; and surface coolers (6) are also arranged at the air inlet ends of the reversible fan (16) and the fan (26).
5. The subway station ventilation air-conditioning system energy-saving device as claimed in claim 4, wherein an LC filter is further connected between said PWM inverter and said isolation transformer.
6. A control method of an energy-saving device of a ventilation and air-conditioning system of a subway station is characterized by being applicable to the energy-saving device of the ventilation and air-conditioning system of the subway station as claimed in any one of claims 1 to 5, and comprising the following measures:
(S1) reducing the cold load requirement of a ventilation air-conditioning system of a subway station by adopting a multifunctional air processing unit of a station channel, a subway tunnel train piston air throttling device and a fan driving device by utilizing train braking energy;
(S2) reducing the total power distribution of a ventilation and air conditioning system of the subway station by adopting an island type air supply unit of a multifunctional staircase of the subway station and a multifunctional air handling unit of a station channel;
and (S3) dynamically adjusting the water outlet temperature of the water chilling unit according to the indoor design temperature and humidity, the outdoor temperature and humidity and the indoor air conditioning load of the subway station, determining the water supply temperature of the chilled water, and improving the equivalent grade of the water chilling unit in the ventilation air conditioning system of the subway station, so that the optimal energy efficiency of the ventilation air conditioning system of the subway station is obtained.
7. The control method of the energy-saving device of the ventilation and air-conditioning system of the subway station as claimed in claim 6, wherein said chilled water supply water temperature is calculated by the formula:
t 0 ＝COP fruit of Chinese wolfberry ·(273+t k )/(k+COP Fruit of Chinese wolfberry )+Δt 0 ―273≤t N ―8.5
Wherein, t 0 Supplying water temperature to the chilled water; COP Fruit of Chinese wolfberry The refrigeration coefficient of the water chilling unit; t is t k The condensation temperature of the water chilling unit; k is a correction coefficient; Δ t 0 The actual temperature difference on the evaporator side; t is t N Dry bulb temperature was calculated for the platform air design.
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